Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community - FT86CLUB - View Single Post - P0300, P0303, Rough Idle/Surging and Stalling, 2017 BRZ 6MT bone stock

96z2 · 09-16-2022, 04:01 PM

OP update:

Dropped off at dealer 8/18/22. Their initial diagnostics pointed to an internal engine issue (not ignition, not fuel injection). They were finally able to take the engine out of the car and open it today and found a broken valve spring (I don't remember if it was intake or exhaust valve) on cylinder 2. Original CEL code was P0300 and P0303, cylinder 3. Apparently "lucked out" that there doesn't appear to be any collateral damage or piston damage.

Unbelievable how a 1-owner, bone stock car with only 27,600 miles, never tracked or autoxed (or really even driven hard for that matter) could have this issue. I thought the valve springs were upgraded at some point before 2017? No misshifts ever, oil changed every 5k miles or less, driven very conservatively, always let engine warm up completely before going past 2500 RPMs.

I'll do a search on the bad batch of 2017/2018 engines, but if anyone has experience with this or can point me to threads, I'd appreciate it. 5-year powertrain warranty ran out 1 month prior to this. Working with SOA to see what they can do. Seems like a design flaw or workmanship issue that they should be on the hook for. 2017 BRZ 6MT w/PP.

09-16-2022, 04:01 PM	#17
96z2 Member Join Date: May 2012 Drives: N/A Location: CA Posts: 49 Thanks: 13 Thanked 20 Times in 9 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	OP update: Dropped off at dealer 8/18/22. Their initial diagnostics pointed to an internal engine issue (not ignition, not fuel injection). They were finally able to take the engine out of the car and open it today and found a broken valve spring (I don't remember if it was intake or exhaust valve) on cylinder 2. Original CEL code was P0300 and P0303, cylinder 3. Apparently "lucked out" that there doesn't appear to be any collateral damage or piston damage. Unbelievable how a 1-owner, bone stock car with only 27,600 miles, never tracked or autoxed (or really even driven hard for that matter) could have this issue. I thought the valve springs were upgraded at some point before 2017? No misshifts ever, oil changed every 5k miles or less, driven very conservatively, always let engine warm up completely before going past 2500 RPMs. I'll do a search on the bad batch of 2017/2018 engines, but if anyone has experience with this or can point me to threads, I'd appreciate it. 5-year powertrain warranty ran out 1 month prior to this. Working with SOA to see what they can do. Seems like a design flaw or workmanship issue that they should be on the hook for. 2017 BRZ 6MT w/PP. Last edited by 96z2; 09-16-2022 at 04:16 PM.